Gravity circulation mixer

Abstract

A gravity circulation mixer for bulk goods including a mixing container in which the bulk goods are divided into two quantity flows. After having recombined the two individual quantity flows of bulk goods in a mixing bowl, it is conveyed via a vertical ascending pipe and a gravity pipe back into the mixing container. The gravity pipe is arranged at an angle with respect to the ascending pipe and extends downwardly into the mixing container. The connection between the ascending pipe and the gravity pipe is constituted by a baffle portion so that the upwardly conveyed bulk goods are deflected at the baffle portion and caused to fall into the mixing container.

We claim: 
     
       1. A gravity circulation mixer for bulk goods including a mixing container having an upper part and a conical bottom, at least two discharge openings for separating the flow of the bulk goods into two quantity flows, a mixing bowl connected to these openings, the mixing bowl being provided with an opening for supplying feeding air and an ascending pipe connecting the bowl to the upper part of the mixing container, characterized in that the ascending pipe (8) is disposed externally of the mixing container (1) in a vertical position and is connected to a first gravity pipe (10) which extends downwardly into the upper part of the mixing container, that the mixing bowl (6) is laterally offset with respect to the center axis of the mixing container so as to be coaxially disposed in the ascending pipe (8), and that at least a second gravity pipe (5, 12) is provided which extends obliquely to the ascending pipe and connects the discharge openings (4) with the mixing bowl. 
     
     
       2. A circulation mixer in accordance with claim 1, characterized in that a baffle portion (9) is provided between the upper end of the ascending pipe (8) and the first gravity pipe (10). 
     
     
       3. A circulation mixer in accordance with claim 1, characterized in that the first gravity pipe (10) has a larger diameter than the ascending pipe (8). 
     
     
       4. A circulation mixer in accordance with claim 1, characterized in that each discharge opening (4) is connected with the mixing bowl (6) by an individual gravity pipe (12). 
     
     
       5. A circulation mixer in accordance with claim 4, characterized in that a throttle member (13) for adjusting the corresponding quantity flow is disposed in each of the individual gravity pipes prior to the mixing bowl (6) with respect to direction of flow of the bulk goods. 
     
     
       6. A circulation mixer in accordance with claim 5, characterized in that the individual gravity pipes (12) are designed as throttle paths.